Improvement in the mode of attaching knobs to spindles



UNiTnn Sterns Artnr Ormea.

ALBERT M. HILL, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN THE MODE OF ATTACHING KNOBS TO SPINDLES.

Specification forming part of Letters Patent. No. L! 3,5832), dated July19, 1864.

To all whom it may concern:

Be it known that I, ALRERT M. HILL, of Pittsburg, in the' county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Extension Door- Knobs; and I do hereby declare thefollowing to be a full, clear, and exact description thereof, referencebeing had tothe annexed drawings, forming part of this speciiication, inwhich- Figure 2 is a side view of a part of a door with a knob on eachside. Fig. 1 is a similar view to Fig. 2, showing all the parts insection, excepting one knob and spindle.

My improved door knob and spindle belong to the class ordinarily calledextension-spindles, because they may be lcngthened or shortened to adaptthem to use on doors ot' different thickness, and either withmortise-locks or with case-locks placed on the side of a door, withoutthc use of washers or screws to regnlate the length of spindle.

Thereare various devices used in the construction of extension-spindlesfor door knobs, sime of which-are complicated and expensive inconstruction, and others do not allow of an exact adaptation to everyordinary thickness ot' door, but are apt to be either a little too looseor too tight.

My improved extension spindle and doorknob are so constructed as toadmit of exact adjustment, and are extremely simple in theirconstruction.

To enable others skilled in the art to make use of my invention, I willproceed to describe the construction of my improved door-knobs andspindles.

In the drawings, a is a portion ofthe door to which the knobs areattached. One of the knobs, b, has a square spindle, c, attached to it.The otherknob, d, has a cavity, e, extending a sufficient depth toreceive the spindle c. The cavity e is square in shape, and is justsufficiently larger in diameter than the spindle c to receive it easily,and yet fitting it so closely that the spindle c and its knob b willturn when the knob d is turned. Each knob b and d has a bead, i, aroundits shank g at its lower extremity, which keeps the rose or eircle-platef from passing ott' the knob when detached from the door, and holds theknob to the door when the circle-plate is secured to the door, as seenin the left-hand side of the door c in Fig. 2. The circle-plateftsclosely around the shank g of the knobs, and the inner edge ot' thecircular aperture on the circleplate rests on the bead @lof the shank gwhen the knob is in place. It is manifest, therefore, that thecircle-plate f must be placed on the shank g when the knob is puttogether. This is done by making the upper end of the shank where itenters the bulb of the knob ot' the same diameter, or at least nogreater diameter than that of the shank near its lower extremity, justabove the bead t', the shanksg ofthe knobs heilig' made separate fromthe bulb. The. shank and bulb are united in the usual way. A conicalmetallic cap, l, may be used, with porcelain or mineral knobs to coverthe junction of the shank and bulb to make a better tinish, as seen inFig. 2. The two knobs b and d are similarly constructed, excepting thatthe spindle c is attached to one, and the other has a cavity-in itsshank g to receive the other end ofthe spindle c, although this is notabsolutely necessary, as the two knobs might both be made with thecavity e and the spindle made separate and detached from both.

Itis manifest that, as the knobs cannot become separated from thecircle-plates, it is only necessary to screw the circle-plates f f tothe door on opposite sides by the wood-screws s s to attach the knobs toa door of any thickness which will admit of the extremity ofthe spindlec entering the cavity e ot' the other knob. In this case, however, theend of the shank of the knobs would work against the Face of the dooraround the edge of the bore k made in the door for the passage of thespindle, which would gradually wear away the wood, and the knob wouldsoon workloose and shaky, or, it' the bore k for the spindle were ot'equal diameter with the shank g at the bead i, the shank of the handlewould enter the cavity k. To obviate this difficulty and hold the knobfirmly in its place, so as to make a workmanlike job, I use an annularmetallic disk, h, which nts in a circular recess in the inner side ofthe circle-plate f, and the hole in the centerof which allows thespindle c to pass freely through it. This annular disk h rests againstthe side of the door around the hole k, and is held in place by thecircle-platef, while the end ot the shank g ot' the knob rests againstthe outer side of the. annular disk, being pressed up 2 y y 4s, 582

against it by the screwing of the circle-plato f to the door. The knobslare thus held firmly in place, and are yet allowed to work freely, thebead i around the extremity of each knob being ofthe same depth as thespace between the inside of the circle-plate at that point and 4thesurface of the annular disk h, as seen in Fig. 2. l

Having thus described my improvement in extension door-knobs andspindles, what I claim as my invention, and desire to secure by LettersPatent, is-

The combination and arrangement of the Coorknob havin g a bead, ange, orequivalent device, surrounding the extremity ofits shank,

with a circle-plate placed on its shank between the bead and the bulb ofthe knob, and an annular disk, or its equivalent, placed between thecircle-plate and the door to which the l ALBERT M. HILL.

In presence of- A. S. NICHOLSON, JonN M. NEAL.

.ANA

